What is the cost of cleaning up commercial vehicle diesels?

The commercial vehicle industry may be heading towards a zero-emission future, but that remains years—even decades—away. The International Council on Clean Transportation (ICCT) estimates that by 2035 most of the new vehicles registered will be zero emission, powered by battery electric or fuel cell electric setups. Until then, numerous new diesel trucks will be making their way to market. Will these volumes be enough to justify new investments into internal combustion engine (ICE) technology?